Aluminous refractory composition containing carbon
AssigneeChicago Fire Brick Company
InventorHarold L. Rechter
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Abstract
A plastic refractory lining composition which can be applied by hand or trowel to refractory or bare metal surfaces and is particularly resistant to slag and hot metal erosion and to metal skulling is comprised of a blend of high alumina or aluminum silicate coarse aggregates with a fine matrix of calcined alumina, carbon, and bentonite employing a phosphate binder and tetrasodium pyrophosphate for modification and stabilization of plasticity characteristics. Finely divided silicon metal can be included to impart oxidation resistance to the carbon. This refractory is sufficiently "sticky" for ease of building a lining.
Claims6
A plastic refractory composition comprising in percent by weight on the basis of the solids:
- ______________________________________ -2/3 inch aggregate of alumina or aluminum silicate 35-60 -60 mesh tabular or calcined alumina 20-40 Bentonite 4-8 -20 mesh carbon particles 10-18 Phosphate bonding agent 3-10 -325 mesh aluminum trihydrate 0-3 -20 mesh tetrasodium pyrophosphate 0.2-1.5 -20 mesh silicon metal 0-15 and water to bring to a plastic consistency. ______________________________________
In a refractory plastic composition comprising alumina or aluminum silicate, bentonite, carbon, and a phosphate bonding agent, the improvement of having present tetrasodium pyrophosphate in amount effective to increase storage life.
Dependencies are inferred from the claim text.